How do current CO2 levels compare to those in 1990 and historical records?

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Current Atmospheric CO2 Levels Significantly Exceed 1990 and Historical Records

Atmospheric carbon dioxide (CO2) concentrations in 2021 reached 416 parts per million (ppm), a substantial increase from 354 ppm recorded in 1990. This current level represents an unprecedented rate of increase compared to the last 800,000 years and has not been observed for at least two million years.
CO2 Concentrations in 2021

In 2021, CO2 concentrations in the Earth's atmosphere were measured at 416 parts per million. This figure marks a significant rise from previous decades, indicating a persistent upward trend in greenhouse gas levels.
Comparison with 1990 Levels

When the first Intergovernmental Panel on Climate Change (IPCC) reports were published in 1990, atmospheric CO2 concentrations stood at 354 ppm. The increase to 416 ppm by 2021 demonstrates a substantial escalation in the amount of this key planet-warming gas.
Historical Rate of Increase

The rate at which CO2 has accumulated in the atmosphere since 1900 is at least ten times faster than any other period observed over the past 800,000 years. This accelerated pace of increase is a critical factor in understanding the current climate trajectory.
Long-Term Historical Context

Current atmospheric CO2 levels have not been experienced on Earth for a minimum of two million years. This vast timescale highlights the exceptional nature of present-day concentrations, which far surpass natural variations seen over geological epochs.

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How do current CO2 levels compare to those in 1990 and historical records?

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